I need the DTMF enabled on an Option 11. I work for a voice recording company and need the DTMF enabled so my voice recorder can decode the tones and then the customer can search the recorder using the telephone number that the agent has used. At the moment there is only comfort tones, which we can't decode. I have heard it is in LD 15, but I have also been told it has to do with inbound outbound signalling ?????????.